Milling-machine.



No. 806,910. PATENTED DEC. 12, 1905.

J. PARKER.

' MILLING MACHINE.

APPLICATION FILED MAYB, 1902.

UNITED STATES PATET ornron.

JOHN PARKER, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO BROWN AND SHARPEMANUFACTURING COMPANY, OF PROVIDENCE, RHODE ISLAND, A CORPORATION OFRHODEISLAND.

MILLING-MACHINE.

Specification of Letters Patent.

Patented Dec. 12, 1905.

To all whom it may concern.-

Be it known that I, JOHN PARKER, of the city and county ofProvidence,'State of Rhode Island, have invented certain new and usefulImprovements in Milling-Machines; and I do hereby declare the followingspecification, taken in connection with the accompanying drawings,forming a part of the same, to be a full, clear, and exact descriptionthereof.

Milling-machines are usually provided with an arm adjustably mounted inbearings in the spindle-head above the spindle and parallel thereto.This arm, known as the center-bearing arm, is employed to support orassist in supporting an outboard bearing for the cutter-arbor or forsupporting some other gilztachment which cooperates with the spin It isthe object of the present invention to provide means for quickly andconveniently clamping the center-bearing arm in its bearings after ithas been adjusted into the desired relation to the spindle. 1

In practicing the mvention clamping devices are provided for clampingthe arm in each bearing and are so connected that both clamping devicesmay be simultaneously operated by a single operating device. Means arealso provided for adjusting or regulating the clamping relation betweenthe clamping devices, so that they may be brought into and maintained inproper relation to secure an eflicient clamping action at each bearing,such as is requisite for the practical and satisfactory operation of theclamping devices.

The features and combinations comprising the invention will beunderstood from the following detailed description of the mechanism inwhich I have embodied them and will be set forth in the claims.

Referring to the drawings, Figure 1 is an elevation of a milling-machineembodying the invention, the machine shown being one in which thespindle is provided with awormdrive, the head of the machine being shownin section; and Fig. 2 is a detail on an enlarged scale.

A represents the frame or standard of the machine, B the knee, and C thetable.

D is the spindle-head, in which the spindle a is mounted to revolve insuitable bearings. As shown in Fig. 1, the spindle a is adapted to berevolved by means of a worm-gear b and worm c, said worm-gear beingsecured to the spindle. The worm c is secured to a shaft d, mounted inbearings in the spindlehead, said shaft d being at right angles to thespindle a. A sleeve 6 is loosely' mounted on the worm-shaft d, to whichsleeve the driving-pulley E is secured, said driving-pulley being shownin the drawings as a cone-pulley. The revolution of the pulley E servesto turn the sleeve e on the worm-shaft d. The sleeve 6 is providedfatone'end with a pinionf, which engages a gear g, secured to a shaft h,mounted in bearings parallel with the worm-shaft d. To the other end ofthe shaft h is removably secured a gear i, which engages a gear 7c,removably secured to the inner end of the worm-shaft (Z.

Referring to the drawings, F represents a portion of the usualoverhanging or center bearing arm of a milling-machine. This arm isusually mounted in two bearings in the spindle-head, and it is desirablethat said arm should be securely clamped in both of these bearings. Inthe drawings is shown an arrangement whereby said arm may besimultaneously clamped in both bearings by means of a single operatinghandle or lever. The overhanging arm F is mounted in two split bearingsZ Z, each of which is adapted to be clamped about the arm F byclamp-bolts m m. Each clamp-bolt projects through one ear of the splitbearing and is adapted to be engaged by a nut n, provided with aprojecting head or flange n, arranged to bear against the other ear ofthe split bearing. Each of these nuts n is provided with elongatedgear-teeth 12 upon its periphery. Mounted to slide in suitable bearingsis a rod or bar 0, which is provided near each end with rack-teeth 1),adapted to engage the teeth on the nuts 'n. One of the nuts n isprovided with an operating handle or lever g for turning the same. Withthis construction it will be seen that by turning the handle g both nutsn will, by means of the connecting rack-bar 0, be turned upon theirbolts, and thus the overhanging arm will be simultaneously clamped inboth its bearings and by means of a single operating handle or lever.The bolts m on may be provided with heads integral therewith; but it ispreferred to provide each of said bolts with an adjustable head or nut7, whereby the necessary adjustment for wear, &c., may be made withings,a clamping device-for clamping the arm in each bearing, and amanually-operated device for simultaneously operating both clamp ingdevices, and means for adjusting the clamping relation between saiddevices, substantially as described.

2. A milling-machine having in combination, a spindle-head, acutter-spindle mounted therein, bearings parallel to the spindle, aclamping nut andbolt for each bearing, and a manually-operated devicefor simultaneously operating said clamping devices, and means foradjusting the clamping action of each nut and bolt with relation to theother, substantially as described.

-3. A milling-machine having in combination, a spindle-head, acutter-spindle mounted therein, bearings parallel With the spindle, acenterbearing arm mounted in said bearings, a clamping nut and bolt foreach bearing, a single manually-operated device connected With one ofthe screw-threaded parts for each bearing, and means for adjusting oneor more of the screw-threaded parts independently of themanually-operated device, substantially as described.

4. A milling-machine having in combination a spindle-head,cutter-spindle mounted thereon, bearings parallel with the spindle, acenter-bearing arm mounted in said bearings, a clamping-bolt for eachbearing, a clampingnut for each bearing, a lever connected With one ofthe screw-threaded parts for the front bearing, gear teeth formed onsaid part, gear-teeth formed on the corresponding part of the rearbearing, and a toothed rack-bar engaging the gear-teeth on said parts,substantially as described.

5. A milling-machine having in combination a spindle-head, acutter-spindle mounted therein, bearings parallel with the spindle, acenter-bearing arm mounted in said bearings, a clamping-bolt for eachbearing, a nut cooperating with each bolt, a single device connected tosimultaneously operate both nuts, and adjusting-nuts on the bolts,substantially as described.

- 6. A milling-machine having in combination a spindle-head, acutter-spindle mounted therein, bearings parallel With the spindle, acenter-bearing arm mounted in said bearings, bolts m for each bearing,nuts n provided with gear-teeth, a rack-bar 0 connecting said nuts, anda lever q secured to the nut n for the front bearing, substantially asdescribed.

JOHN PARKER.

Witnesses:

W. H. THU'RSTON, J. H. THURSTON.

